You could try but a doctor is not supposed to be talking or listening to you about one of their patients. Sorry. If your friend is living with family that is good. They will look out for him. I used to know someone with a dementia problem and if you tried to tell them anything about their health, they would say you were lying. The person was in total denial. Also, when the doctor tried to tell them anything it did not register. They would forget it the next day. There all different kinds of dementia and I don't believe there is much one can do for many people.

It's nice that you keep in touch and I'll bet that is the best you can do for your friend.